Question

i have a problem.

I’m running following query. I have only one record in my database but i’m getting 9 results.

SELECT c.id, c.rk 
FROM cv AS c, employee AS e , cvCat AS cv_cat 
WHERE c.status=1 
    AND c.empIDFK = e.id 
    AND cv_cat.categoryFK IN ( 17,18,19,38,39,40,41,44,45,46 ) 
    AND cv_cat.cvFK = c.id

Can someone please let me know if they is any problem with this query. Why i’m getting 9 results rather then just 1 result.

This query should only display one record but its showing 9 results.

Answer 1

When you do

FROM cv AS c, employee AS e , cvCat AS cv_cat

You are doing an implicit join of the three tables. If you want to get distinct records you can add DISTINCT after your select:

SELECT DISTINCT c.id, c.rk 
FROM cv AS c, employee AS e , cvCat AS cv_cat 
WHERE c.status=1 
    AND c.empIDFK = e.id 
    AND cv_cat.categoryFK IN ( 17,18,19,38,39,40,41,44,45,46 ) 
    AND cv_cat.cvFK = c.id